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The doctors are doing all that they _____, but the old man is still not breathing properly.
A.shallB.needC.mayD.can
D

试题分析:考查情态动词:A. shall 将会,B. need需要C. may可以,可能D. can能够,句意:医生在做他们能做的一切,但老人还是不能正常呼吸。选D。
点评:情态动词表推测注意以下解题步骤:认真审题,结合所给出的语境,正确把握说话者的语气、情感、态度、观点等。认真思考所给选项中情态动词的基本特征和用法,并结合语境推敲答案。要注意把握时间概念。
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